Amazon calculates a product’s star ratings based on a machine learned model instead of a raw data average. The model takes into account factors including the age of a rating, whether the ratings are from verified purchasers, and factors that establish reviewer trustworthiness.
The mounting is a simple tapered friction hole, which is molded into the plastic device, but has too large a diameter to stay on the electrical plug. The entire mounting will simply slide off the electrical plug if mounted on a wall outlet. I ended up mounting it horizontally on a line conditioning surge protector. If you wish to use this on a wall mount, you may have to secure the plastic device to the electrical plug with electrician's tape to keep the unit from simply sliding off the wall plug.
Why I gave it a 3 star: Could use a little more support when plugged into a socket, as the unit slides away from the holder when you try and secure it better at the wall outlet. It keeps everything in one place without the electrical wire hanging everywhere, so it's all good! Maybe an upgrade where the plug slides into the unit and be a bit tighter.